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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ad9776e1f04d48577e00c0817c12bd74a8327d22bca01e112ac4638082763d' 
  AND token = 'g73QbNavVEQEqf6J7qPyK0GflXv8DGNO1xC7MNBQqtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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