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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd22c6c41dfdd719315effe8dfaaf5656baee8ea06d6c721aa6f6d5db0a95e5' 
  AND token = '/OJjXVz3sYnnTK2UU+w33RtsbGnfz7t6F3yUGopLuRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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