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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190e3948f2842e83d25b3945a8fb2dae4bf50b76dacdb2f1a245b54dc6123631' 
  AND token = 'DWKRTt84mYk94OgZAlATGWA+0EMJ5JcdLugxv+dobKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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