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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51193e804a648f8cb48a080f04dccffda895aeb8286137e2f9d2f46362f88801' 
  AND token = 'IVAhUNEn231hDD1uZFR1yYZIoEw0mMschofwKnxoJqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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