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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128af1b863161c5a96e67616b232322dcbabbc4cbf7e2fa7a1906d7725c0ea68' 
  AND token = 'ID65W+zFqeU2PIMHhvPWMwHryR/7Yk4DU8ZFr0KMhgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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