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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a62c88cb43da3c07ceb3d3ca6ae56530f8135458d2e60f09c9249ab3763d7e' 
  AND token = 'rUBt9XtXixi0FkYMT1MSvTk4gTo8AxyDElYruWOWaQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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