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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98da828bdcd64f01592d5f57eafc1f514398aa218fefe0e854d090cab13dfc57' 
  AND token = '1398BH+39q8Nd07EcVNbj64BnKJIpLG4g0QYQjww+00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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