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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0985de78ea0bc170bd1a398e788de85c97ad76dfa0c8b5763bf93584e05061d2' 
  AND token = 'XewJHUiai/pLDlsMeDkAXVod4F0XF25pS9cQfVJAxZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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