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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f5f2b6f9f3e85254ffbc2e60564a53270c4f8d8503319fee6b6b20b8bac096' 
  AND token = 'SNe+eLykGDXtKRPkiUdpNspEewa1lYSd0ggjA6KBznE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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