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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e08758dd7c2dd5c18b7e6357020b15a664a1adf19faa9a543efc1e90ae63030' 
  AND token = '3Bc7bcu8I4FW7PGYf7z3iu2jU6Lg34dJJiiEJFceFRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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