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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5411d3fe99906b0a77725e9af762fb3010f2d556f85d8b425638db055919dee5' 
  AND token = 'QYfk9xKTve67m1gYtmbtoRGWUFidhwggtatnq+Q7KEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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