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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e89381ae8f8dcba8575d2a1bb24bd5ed9440bd1b4478345f74dfe1fc2753af' 
  AND token = '3SVTrRCkwvNkU84SCBMLTsHYKKWSBaqkOZOH2q43nN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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