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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531935e32738c36d56c757ef10d6ca4a175c41fe2912adb21bd822d77f30b5d2' 
  AND token = 'Y7EgYgW417HE3stvEWZEKPVroVvHKWB3uvV6t06NiG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}