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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da6faf8e49b4053b275d04f7c6456660492deab322a83e9879e8df5912799bd' 
  AND token = '2pA6fQTMNsvavAzUm3rG47Q7qgAm+SQf81FFxCHuLhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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