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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc63a2618212e4c3ad5f8d7f850f2c2ced986d60e3beec3576ab277c3bbebf3' 
  AND token = 'zw+aX6KHD8CRT6OYni8d0oddCxjda5vvXpj4TaOTDHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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