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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd5f6e76776d0fbed65ae30ae0c8ee371586425bbae3cb06ea2df770263c4f9' 
  AND token = 'W+ipT1rAYeCJZSCpGYjcZaZ+QgypUwAGaqUE6Zn/RQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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