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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90715d9115bad13731df584bfe46346a785793dfe10084ab71d28eb3eaf777e7' 
  AND token = 'R/K3uRGAQJ5e84KrGRE0fsnzI73mAyAVpz8qMtYU3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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