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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1713d2942f96484bde0b4c7f2e80df4e89bfa9a1be3d9ed00944b9aba872565d' 
  AND token = 'OwxegeNuZjKeXK30Gnv52y0VdiVU7pT1I/xEu1wamBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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