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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd1dafc833c3e42fad259a9e29a0115f31dee4d1ad6b62319d9103d2de3775a' 
  AND token = 'zPBgSCTEDZfaV9OJyW5hvCY2bbyF77O17elZqyuAilU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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