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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3b540a9a440540c8c3a904d4670603d146079393a07e5a07a1a9b4de593e29' 
  AND token = 'b/pvfHzwslwdCrLdfyBKQqNk4gPEvPNl6iar2ZjBQcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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