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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4a52eab482774697bc280a16f87cbf232885691ff23bdf3fdae116715bbafc' 
  AND token = 'Avpu7RnD52IDJAS/7f/4EvI9nnmSlUBNEFWt7SNg0S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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