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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1aab0728ea838c4ccab0717d6103be646c611552f699b2645c45106303105b2' 
  AND token = '08W5cVlOhXNbIPUkqMbs9a4rwK5FdqjZXgBfZ11/USQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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