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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b926960d8e5204da02c6d66b7a353504bc63ca786b0e6cf48c48b5d416c102' 
  AND token = 'HpTEKZsshdeHdwW2jO+INjhOzn/bakBhtcuBq3WxPsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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