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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e87a5d46c7be8b8f9cb5913e47dda1ae34031d444dd86f61ffc40dc44fb62e3' 
  AND token = '7VZoQuc/VbpXrKHMzg1+9q3SDNm/O25UtfbdP/wEr+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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