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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763ca69a2608210c9a765b0c415d0aab5fad5cf9b54a49b0ede753f544a830ef' 
  AND token = '8x8HY7YD/bizNHivhFokEMciTLEPIQVOaI58O9Da3aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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