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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f046ec4e6507b93ede6280d95e06ba49d75aff5289fbf3ab2f7d2dc34dac5ce2' 
  AND token = 'wEdTvmrtttwc4ErR+qKM2nYi7NQH+avLyzy7TdrzSAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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