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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4f35e4ff7b458bba96227176b32f1c029fa7a10e7175751837ea6698c1e268' 
  AND token = 'F+hykuxDrf3JAESDmsE9PqDowI9VOTg2xKiLL8N5qKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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