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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5432bd1c3e4a729a8973387873293b0f8d9aadf73d9af92e7a219cd55e93c4fc' 
  AND token = '3uQvsia6j63ztHjFlD1U8faZ0+gp4ayL0ixnjKdrVBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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