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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ae15c33c68f189461176112f9089c0bb1e5d3044dfed3fa1b2ecfb2a5f35d9' 
  AND token = 'X3WSyF0mcWw+r3jgHGwND9OwVAekiXoUXm6RmVVbu3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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