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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52d093592b929f1a3a6ccf91e580c7679262c22a7de4d81e295ea17c8b764d3' 
  AND token = '4bfHWBCAXL3Kg34d5uY6vGh3oLRy6mcptGHm9kP3WS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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