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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a030c6e49ed7e09f36dd8a6ffeb6cd30793385e16fe1fbe22b53371d8d7a3c49' 
  AND token = 'xaOcfoEwjWTsiblPVWIEzyTLCCT/z1JVjYE8IMVhXLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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