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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e076a455d0f5571c7a62b00fa63f46ea3699c0688c39a51a2b922c7d4503135' 
  AND token = '2Unn1cDNBzBCRRcBxvoy7g8JqOw94+gnVf+R4ZkOe0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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