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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f27ea2917f80bc39a714b850e4a143e786994d7f239daee00a6b651fd6bb5cb' 
  AND token = 'ruPFgAoL/O9yMdw7hBZJajAY8rLqeYmEC0b8oiYNkHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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