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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28da679ccc7bb13f676d470f4e91bf434b0ae2212f1acae2350d4c3a5b6b338c' 
  AND token = 'oC44who0res7lJy/v3L49icn79hMuGK2mUgeN4yz5F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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