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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4956a68633c17562ae23eef4c127ab3fbd759bc55784071d54cc10f09d7b1306' 
  AND token = 'OctNSYbkKgONdbxVgshe4C7tUn/04POqwMh9qKNxEfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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