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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99e162e89e8e7637e9b3a02f2cba9401256748cf1715fe883bdba23df998080' 
  AND token = '81HD9RQpbwkC++n7+7jYCdF0EOIZu9jfC5o/ZeOqoXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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