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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ed846cf541920ba7ce7f2bbab414ce1d14464f436660b41f76c8c7a0a60551' 
  AND token = '6E/xlvvwmN2mDEEPUNGiQ9//sCX1kpH9ZiGIxqtZ8no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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