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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090c8b08788342b428e3ed2aed5900015a0b5f45a330f7bcd5fd92dce55e26bf' 
  AND token = '+mlEL+K8PB3CwbFucPFJ9x19kmyeT1/i73SuUua3lLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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