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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613d412b99ba0a33c7eecd17ab921b8c0f9b2760b953a7a781f50c5c5e91147a' 
  AND token = '2jK5aa54Z24kacQ/qgB301xkLpGoSHmpb4grzwSqXAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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