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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feae61c3ce903a03b3473d658ecb8cc8dc93d8c1b5d30918eb786cd58208dd05' 
  AND token = '3j9TCNjOlrIw1ty30LKaCKH3MDsGoG0zvw0gx0jU5G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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