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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2713fd95575512d7c833a07c6365c0b2ae608ee1bc401cf50c81ec40d623f68' 
  AND token = 'wYfiD2S2Zhxt8kF2zpxmE7r1dLwI2bGsAFTfp/nSsYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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