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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e9f54e51dec94a11ded53fda87a565dbb6077fcf62cb1f15ca53730f8662fd' 
  AND token = '6Nz5hkvPNyQ2bxJlOOX/+bsU632gC5xypMntQkYX5q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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