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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e4c62a162e00c44ff4e7ebae589791777c260d7b18e8f0464e53e62e2c8b36' 
  AND token = 'pnBFBYtelV1/q/9LOJIkeUqTkMstTr2T2sm7q1PREmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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