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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a897980b729af77911b6d69db974ba2a702492912bbdb94b5a50076c1eb20389' 
  AND token = 'rTYjN9hun8H+QMMTFtDKaOvKDnVVMDjLOr07XkBmPis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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