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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e0845589953d23a0b26096fd33b8417031a923cd447396f0e14cd683e85b57' 
  AND token = 'sYw8VRHPFWxPn+1iceZ4s+12ULLpV+Ytuj+6sLwoFEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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