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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6afa81bdf781854eb8534e52b29f8decde093b8891054105e2b34bb4878efbb' 
  AND token = 'p0rXwdsUWVAfLMOR/EB1o2KF4gHBXHvu6gOoVYxSEhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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