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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decc43687793cdf68bc0f8a0bbe8b61585af32f5b44fb1fb39986d7972423cb0' 
  AND token = 'Ejw38BcjSSqd8RejGth4P0xGEmnKbcbRnGDLS6D7ul0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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