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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffd47d57d25555ba7a01777f40c740a852993138e360c6ca9e6978134a02cd5' 
  AND token = '62arxmjyoUUM/61TR4GHFrBeoV7JQEp+X5eE6qWM0tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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