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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa1326ff46167932ed4a293daa2c9ba5899ad874ac25ee91b09984feb832b75' 
  AND token = '/6FLOxAUXF9Dajytuc/XNZcrG8Rnm2G35tHWcE38E/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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