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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0803558fe3d28d5dde0f174102d57af35a83ed49cd735bec325f27aac45dc914' 
  AND token = '+KlNzfAAXJ8RSGg4CBo8Rxn8j2En+HbVoNuH3yNbhaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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