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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624ba4b7c4458321c5ab530e36ba502bb41a131e24bf527fd794f1f3eb0d2b58' 
  AND token = '7u/WGIh7anJtn1bwZCdaikgyb8ybARpRB3wbltedQ8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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