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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd203ad7e3def4daafec30de62157609c6742adc7006dada816404786ccbb17fd' 
  AND token = 'w7i3T4umq4pQB9ZESo50trqygl9F8rXVfAtgk2frnPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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