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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5f7686e77f8cde3ac7009469bf184365ee1b1c2c356c356cdb88253499b151' 
  AND token = 'cM7FWG8JR5XBszMbQqkB4XKb8pNX/1GqUuWgWxyQna0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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