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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06da73a39261bcf64ed64b51be7c168b7c41cadd1c3beaf279a0bc9d51aae4d8' 
  AND token = 'oKNbYZcupLTj28VvGFhhoC30FkU9s9jHjqQNsetwaK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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