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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd6dbec5f77da6c6a4cba710a16b4f9297d031671752e5a121f410d58478460' 
  AND token = 'P9jQrbdqwt5pxh6oWm62PNs3MY+qZ4URgn4kW/m7lP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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