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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aaed571d3f35dbd36f00657e8a2ae4058ab06227c38fc28d0beb2a50c81e199' 
  AND token = 'dfopZJOo2LAknASxxyA01R7Z4iy1d2RcbHHq68Q4iUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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