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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004400092eb626383c175b73481281560920d59afea61968846ea2dd08d928be' 
  AND token = 'l1eCrj++cr0yoVBabY0re5Mg5tZP5TjpMXbZAOLb04s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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