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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3631661878b333856318690cde4e730725263b00f4160b6609eb9e6564ea7da3' 
  AND token = 'Z9zxGPG1xMxLKN2cLQ2e7lb59T6VumI/JeyvHJF2xiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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