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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c173638269c5a229abc0a93d2a6047c896d45e910530a1fbba036f31cccca0' 
  AND token = '0hV8pnjka0UuAmVacFs8hgo84QJ4OIKGud65X80Jy9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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