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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b691d6071248009a312f94ee926cdcf15015aa317d073fe300821f8a48cd5a' 
  AND token = '20uphTANtBtuXSGUIfbdowChErsPXgzrmbOIHZIdN1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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