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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9182ddd442cd59538c3be55a7fd2383db3d7a8277be753ce792990022fb42b' 
  AND token = 'jSNlPqq+RX54uKBccoDcdUWfaozM9LrrUHru3VVKU4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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