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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0021f228b84be6a7438377b6e5e9752d0ab601d1369d4702f01cd0e0308c522' 
  AND token = 'YS2M/770u4oo+ptQPxzNxDhxnjxKdCkm4pujJitMlLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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